Diablo 2 is a very popular sequal to the original Diablo that as described before is a dungeon crawl game in which you search to destroy the prime evils while leveling up (increasing stats and skills) and improving your gear as you progress. It is still popular today over 10 years after its launch due to the use of free online multiplayer through battle.net. Although it is no where near as popular as originally and is filled with spam and bots on online servers.

Like my boys said; it's a dungeon crawler where you can play as 7 different heroes with 3 major skill branches each. In a natural progression you play, get stomped, eventually kick ass, dominate, and then evolve before realizing that what you thought was going to be dominant, wasn't. At this point you find better gear/stuff for your own character and mostly for other character types you'll be driven to make. This is one of the best games ever but the sheer number of character builds, the player vs player,and the inevitable fact that you will make the same character again, better, keeps this game alive and unnaturally addictive above even such as World of Warcraft.